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Moderately Distributional Exploration for Domain Generalization
Rui Dai · Yonggang Zhang · zhen fang · Bo Han · Xinmei Tian

Wed Jul 26 05:00 PM -- 06:30 PM (PDT) @ Exhibit Hall 1 #730
Domain generalization (DG) aims to tackle the distribution shift between training domains and unknown target domains. Generating new domains is one of the most effective approaches, yet its performance gain depends on the distribution discrepancy between the generated and target domains. Distributionally robust optimization is promising to tackle distribution discrepancy by exploring domains in an uncertainty set. However, the uncertainty set may be overwhelmingly large, leading to low-confidence prediction in DG. It is because a large uncertainty set could introduce domains containing semantically different factors from training domains. To address this issue, we propose to perform a $\textit{mo}$derately $\textit{d}$istributional $\textit{e}$xploration (MODE) for domain generalization. Specifically, MODE performs distribution exploration in an uncertainty $\textit{subset}$ that shares the same semantic factors with the training domains. We show that MODE can endow models with provable generalization performance on unknown target domains. The experimental results show that MODE achieves competitive performance compared to state-of-the-art baselines.

Author Information

Rui Dai (University of Science and Technology of China)
Yonggang Zhang (Hong Kong Baptist University)
zhen fang (AAII UTS)
Xinmei Tian (University of Science and Technology of China)

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